Today, those spells now need full bar charged before releasing lv1 spell and additional lv were added slowly after that which make these spells useless.
Probably a connection issue, either the server’s lagging or your internet connection’s having some problems. I know it, as It’s one of the things I’ve noticed while leveling my Wizard.
If it’s the server lagging, it’ll most likely sort itself out when another maintenance happens. Well, at least that’s what happened after last week.
oooh no i didn’t lose quick tap casting on my beloved energy bolt did i
Happens to me every Sunday evening until maint. During this period, I don’t even finish my dungeons on my necro 
7 seconds to cast Flesh Cannon get out
Similar to multishot charging its latency depentant. If theres no lag involved at all a full lv15 charge equals the full bar (1.5 - 2s or so) but sometimes it will just go to 8 in the same time, even had lv3 once - it literally would take 10 seconds to charge for lv15 which makes auto attacks a lot better sadly.
You can always try a different channel it helps quite often.
Still works for me : Level 3 energy bolt, can release it at 1/3 casting bar and release lv 1 energy bolt.
You probably just have lag.